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Chapter 18: Q13PE (page 664)
Two point charges are brought closer together, increasing the force between them by a factor of 25. By what factor was their separation decreased?
The separation became .times of the original.
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If two equal charges each of\({\rm{1 C}}\)each are separated in air by a distance of\({\rm{1 km}}\), what is the magnitude of the force acting between them? You will see that even at a distance as large as\({\rm{1 km}}\), the repulsive force is substantial because\({\rm{1 C}}\)is a very significant amount of charge.
The practical limit to an electric field in air is about\(3.00 \times {10^6}{\rm{ N}}/{\rm{C}}\). Above this strength, sparking takes place because air begins to ionize and charges flow, reducing the field. (a) Calculate the distance a free proton must travel in this field to reach\(3.00\% \)of the speed of light, starting from rest. (b) Is this practical in air, or must it occur in a vacuum?
Why does a car always attract dust right after it is polished? (Note that car wax and car tires are insulators.)
An electron has an initial velocity of\(5.00 \times {10^6}{\rm{ m}}/{\rm{s}}\)in a uniform\(2.00 \times {10^5}{\rm{ N}}/{\rm{C}}\)strength electric field. The field accelerates the electron in the direction opposite to its initial velocity. (a) What is the direction of the electric field? (b) How far does the electron travel before coming to rest? (c) How long does it take the electron to come to rest? (d) What is the electron鈥檚 velocity when it returns to its starting point?
A certain lightning bolt moves 40.0 C of charge. How many fundamental units of charge is this?
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